The OptimEye S5 is the most widely used satellite-based athlete monitoring technology in elite sport. Combining inertial sensors with access to both GPS and GLONASS satellites, the OptimEye S5 provides all the physical data needed to answer your performance questions.

The OptimEye X4 is the professional and practical GPS-based solution. Designed for coaches and sports scientists interested in data accuracy, reliability, and measuring the volume and intensity of athlete workload